diff --git a/test/classes/Dbi/DbiDummyTest.php b/test/classes/Dbi/DbiDummyTest.php
index 418f3594a0..82de9d899f 100644
--- a/test/classes/Dbi/DbiDummyTest.php
+++ b/test/classes/Dbi/DbiDummyTest.php
@@ -135,4 +135,17 @@ class DbiDummyTest extends TestCase
             ],
         ];
     }
+
+    /**
+     * Test for string escaping
+     *
+     * @return void
+     */
+    public function testEscapeString(): void
+    {
+        $this->assertEquals(
+            'a',
+            $GLOBALS['dbi']->escapeString('a')
+        );
+    }
 }